VSB
Valve stem seal
A valve stem seal is a positive seal that is pressed into place at the end of the guide and wipes the oil off of the valve stem as it reciprocates. Tight control of the fit allows a small amount of oil to pass the seal
Valve stem seal
A valve stem seal is a positive seal that is pressed into place at the end of the guide and wipes the oil off of the valve stem as it reciprocates. Tight control of the fit allows a small amount of oil to pass the seal